The paper is not evenly distributed across the web, which is mainly due to the uneven flow rate and evenness of the feed into the pan headbox, uneven flow of overflowing pulp, and uneven white water discharge from both sides of the trough. Generally, the flow rate of the wall of the trough slightly lags behind the center, especially when the wall of the trough is relatively rough, and when the width of the door is wide, there is even a case where the throat of the trough is not in the center, and the structure of the head box is unreasonable. The following measures can be used in copying:
(1) Add fresh water to dilute the concentration of the local paper stock solution to reduce the tendency of large local pulp stocks.
(b) The active arc-shaped plate mesh slot can adjust the distance between the movable curved plate and the two sides of the mesh. This distance must be adjusted properly. It has a great influence on the formation of paper. If the distance is too close, the pulp speed exceeds the speed of the web, causing the paper to appear thin. If the distance is too short, the paper sheet shows a flake-like or flower-like phenomenon. Generally, the side of the paper is large in volume, and the distance between the curved plate and the cage is adjusted. On the contrary, the width is increased.
(3)Adjust the distance between the rubber skirts on both sides of the spray plate, ie increase or decrease its side to achieve the purpose of adjusting the thickness and flatness of the paper. There is also the purpose of cutting the rubber skirt into a circular arc to overcome the middle of the page. The disadvantages of the thick two-sided book.
(D) The lifting regulator (grinding knife) on the headbox can adjust the unilateral ration of the paper. The adjustment plate rises. The flow rate of the liquid in this segment of the feed material is slowed down, and the flushing effect is reduced. In other places, the feed liquid in this segment increases the sizing, that is, the quantification in the segment increases.
Source: China Paper Net
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